克里与俄罗斯外长将就乌克兰危机举行会谈

U.S. Secretary of State John Kerry is in London for talks with Russian Foreign Minister Sergei Lavrov on the crisis in Ukraine.

Friday\'s talks come as the Ukrainian region at the center of the crisis -- Crimea -- prepares for a referendum Sunday that could see it break away from Ukraine and join Russia.

U.S. and European leaders have called the Russia-backed referendum "unconstitutional," and Kerry has warned Moscow of serious consequences if it annexes the Ukrainian peninsula.

But Russian officials say voters in Crimea have a right to self-determination following last month\'s collapse of the pro-Russian government in Ukraine. And Moscow on Thursday acknowledged deploying thousands more troops and military hardware near the Ukrainian border for maneuvers that will continue for two weeks.

The deployment is in addition to the 20,000 troops Kerry estimates Russia may have in Crimea.

在美俄两国外交首脑星期五举行会谈之际，作为危机焦点的克里米亚正准备星期日举行全民公投，投票结果可能导致克里米亚脱离乌克兰，加入俄罗斯。

美国和欧盟领导人一直把得到俄罗斯支持的克里米亚全民公投称做“违宪”。克里警告莫斯科，如果俄罗斯并吞属于乌克兰的克里米亚半岛，将产生严重后果。

但俄罗斯官员表示，在亲俄罗斯的乌克兰政府上月垮台后，克里米亚选民有权进行自决。星期四，俄罗斯承认向乌克兰边境附近增派了数千军人和军事装备，准备进行为期两周的军事演习。

在俄罗斯增派部队之前，克里估计俄罗斯可能在克里米亚驻军两万